Stock Rotors or "Upgrade"

[krisk]

While this question is pertaining to my 2024 Mustang, I'm asking it in the general section because it really isn't platform specific. My question has to do with stock versus upgraded rotors. My 2024 Mustang GT has the Brembo brakes with 6 piston front/4 piston rears. I've run the stock brakes with upgraded G-Loc pads for several track days and I've had no issues with them. I am ordering a spare set of rotors for when I need to replace the originals. In going through this exercise, I have a few options. 1. Buy the stock GT rotors: $400 per set of 4 rotors. 2. Buy the Dark Horse OEM 2 piece front rotors (Dark Horse rear rotors are the same as GT): $1,000 per set or 3. "Upgrade" to Baer Eradispeed+ 2 piece front and rear slotted rotors: $1,500.

My question is this. Is it really worth paying more than double to either go to the two piece rotors? I have heard they cool better, but I figure if the stock are working for me, I can buy twice as many and still be ahead. Thoughts?

 

[EF1]

There is nothing wrong with stock rotors. I have found that 2 piece Girodiscs last longer than stock but not enough to justify the $$.

 

[byronj]

From my experience, I gave up on the stock rotors. I went with Girodisc 2 piece. The front last about 4x longer that the stock rotors. When I did the calculation its cheaper for me to buy replacement rings at 800 a set. The rears I am still on my 1st set of rings. I even had them on for a couple of years while running a set to CC rotors for about 2 yrs. I run Pagid RS-29 all around. I did keep a full set ofs stock rotors just in case if I need them as a back up. But thus far things have been pretty good for me.

 

[krisk]

From my experience, I gave up on the stock rotors. I went with Girodisc 2 piece. The front last about 4x longer that the stock rotors. When I did the calculation its cheaper for me to buy replacement rings at 800 a set. The rears I am still on my 1st set of rings. I even had them on for a couple of years while running a set to CC rotors for about 2 yrs. I run Pagid RS-29 all around. I did keep a full set ofs stock rotors just in case if I need them as a back up. But thus far things have been pretty good for me.

From a cost standpoint, the two piece rotors would have to last 4 times as long to make it worthwhile. Glad to hear that has been your experience.

 

[byronj]

From a cost standpoint, the two piece rotors would have to last 4 times as long to make it worthwhile. Glad to hear that has been your experience.

I have been very happy with my set up. FWIW- people notice my car going around track. I am. hard on the brakes when I need to be and I got 12 events of of my front Pagids, I could have gotten 14 but I didn't want to push it. (Sonoma is my home track so lots of braking there). I've been very happy with the lack of maintenance and purchases after the initial purchase. I also recommend buying your stuff from Ken @KNS Brakes. (TMO supporting vendor). He will get back to you even while he is at the track or his wife will call and get your order placed. I text him and say I need this or that and he has it to me in Commifornia within 3 days.

 

[Mad Hatter]

Just a note, ""Upgrade" to Baer Eradispeed+ 2 piece front and rear slotted rotors: $1,500." this would not be a upgrade over stock discs. I think the nicest way to say it is that Baer brakes are not track compatible, they are more for the show car type crowd. The 2pc Dark horse rotors sound like a good deal but I go through rotors in 4 to 6 hours on the track. Not really worth it to me as far as costs go.

 

[krisk]

Just a note, ""Upgrade" to Baer Eradispeed+ 2 piece front and rear slotted rotors: $1,500." this would not be a upgrade over stock discs. I think the nicest way to say it is that Baer brakes are not track compatible, they are more for the show car type crowd. The 2pc Dark horse rotors sound like a good deal but I go through rotors in 4 to 6 hours on the track. Not really worth it to me as far as costs go.

Thanks for the feedback. I went ahead and ordered set of stock rotors for $400. I've looked at Girodisc rotors, but they don't appear to be available for the S650 yet, and it looks like they will be in the neighborhood of $2,000 for a set. I'll see how long the OEM last then decide if I want to upgrade once I install the current replacements I bought.

 

[jaylarold]

I didn't realize the Dark horse moved to a 2 piece rotor so thanks for that tidbit. After doing some digging, I believe this is the part number: PR3Z1125J. However I can't really find any information on the weight differences between this rotor and a stock rotor so kinda makes it hard to determine if they are worth it.

 

[byronj]

Thanks for the feedback. I went ahead and ordered set of stock rotors for $400. I've looked at Girodisc rotors, but they don't appear to be available for the S650 yet, and it looks like they will be in the neighborhood of $2,000 for a set. I'll see how long the OEM last then decide if I want to upgrade once I install the current replacements I bought.

Call Girodisc and ask to be the test bed. I had the 1st set of rears for a GT350. I did a full write up and photos, took temps, and gave them what they asked. In turn I got (pun intended) smoking deal from them on the rears.

 

[krisk]

I didn't realize the Dark horse moved to a 2 piece rotor so thanks for that tidbit. After doing some digging, I believe this is the part number: PR3Z1125J. However I can't really find any information on the weight differences between this rotor and a stock rotor so kinda makes it hard to determine if they are worth it.

That is the correct part number for the Dark Horse front rotors. The interchangeable one piece rotors, which come with the GT Performance Package, have the same part number except the last letter is a C instead of J. I have no idea of the weight savings with the two piece rotor either.

 

[Bill Pemberton]

I have run Girodiscs for over a decade and they will wear better but they will help you go deeper into a corner also. I have gone a slightly different route than some , running the stock rotors in the rear. They just go along for the ride to a degree and that might save you a little bit I the future.

 

[Ewheels]

For what it's worth, I really like the DBA T3 slotted rotors. Might not be available for S650 yet but at least for my S550, they are fantastic.

About the same cost as OEM, claim to have some of the best cooling designs in the industry (have not tested myself though), last a good while, and I like the slotted design over OEM as I've noticed they help clean up the pads if you ever glaze them. Seem to have a bit better 'bite' over plain non-slotted rotors, though that might just be in my head. Overall: no issues, work great, and easier on the wallet than Girodisc.

 

[Bill Pemberton]

Have run both extensively and there is an advantage with the Girodiscs. Whatever you do, if you decide on DBAs skip getting drilled rotors ( or any kind of drilled rotors. I was given a set of DBA drilled rotors to test and they cracked over one weekend.

 

[krisk]

Have run both extensively and there is an advantage with the Girodiscs. Whatever you do, if you decide on DBAs skip getting drilled rotors ( or any kind of drilled rotors. I was given a set of DBA drilled rotors to test and they cracked over one weekend.

Thank you for the feedback. I've not heard a single good thing about drilled rotors for track use, so I certainly intend to stay away from them.